20 Most Recent Yamaha EF6300iSE - 6300 watts/52.5 amps 120/240 volt. Portable Inverter Generator - EF6300iSDE Questions & Answers


If you are referring to the crankcase ventilation, it could be that either the engine is overfilled with oil, or the cylinder could be glazed and the engine requires a moderate to heavy load every so often to prevent this from occurring.

I would recommend that you stick with mineral oil with a grade of 10w/ 30, even better just use the OEM stuff, or Honda 10w/30 is easily available.

Some of these small engines have a chrome bore and do not like synthetic oils, it will cause cylinder glazing and excessive blow by.

Change the oil when it is starting to become contaminated, ie. getting carbon in it, rather than guessing at hours of operation.

If it's not the CCV your referring to, it must be leaking oil from the engine somewhere and blowing back via the cooling fan, this will require a thorough clean and further investigation to diagnose correctly.

Most common areas of oil leaks are the crankshaft seals and valve cover gasket.

I personally would start with an oil change to mineral, and place generator on a loaded circuit for a while, don't kill it just load it, and see if you have any improvements.

Hope you find this helpful.

Yamaha EF6300iSE... | Answered on Feb 21, 2018


The generator does not operate in accordance with the specified technical conditions, such as too high stator voltage, iron loss increases; if the load current is too large, the copper loss of the stator winding increases; if the frequency is too low, the cooling fan speed becomes slow, affecting the heat dissipation of generator; the power factor is too low, so that the rotor excitation current increases, resulting in the rotor heating. Check whether the indication of monitoring instrument is normal. If it is abnormal, necessary adjustment and treatment must be carried out to operate the generator in accordance with the specified technical conditions.


Diesel generator set more supports: www.dieselgeneratortech.com

Yamaha... | Answered on Apr 11, 2020


Hi, maybe you can contact your supplier who supplies the generator to you.

If you want to have diesel generator set in future, please visit at https://starlightgenerator.en.made-in-china.com

Yamaha... | Answered on Dec 07, 2019


More supports, please see at www.dieselgeneratortech.com

Yamaha... | Answered on Oct 22, 2019


Here is some reasons for reference:
1.After the diesel generator is stopped, the residual magnetism is often lost, because the material used for the magnetic pole of the exciter is close to the soft steel, and the residual magnetism is small. After the shutdown, when there is no current in the excitation winding, the magnetic field will disappear.
2.The magnetic pole of the diesel generator loses its magnetic properties.
3.Damage of excitation circuit components or circuit breakage, short circuit or grounding phenomena.
4.The exciter brush is not in good contact with the commutator and pressure of brush holder is insufficient.
5.Excitation winding wiring error, opposite polarity.
6.Stator winding and rotor winding of generator set open circuit.
7.Poor contact between diesel generator brush and slip ring, or insufficient brush pressure.
8.Diesel generator lead wire wiring is loose or switch contact is poor.
9.The fuse box is fused.
10.The "auto-manual-de-excitation" switch on the control panel is in the de-excitation position (automatic generator set has "auto-manual-de-excitation" switch).
11.The voltmeter is damaged.
12.Rotary rectifier module is damaged.

Yamaha... | Answered on Oct 22, 2019


Start by replacing fuel. Completely drain the tank and carburetor fuel bowl. Do not use what fuel you may have, get 2 gallons of fresh fuel from gas station. If problem clears then likely water in fuel.

If still backfires with fresh fuel then likely an ignition issue. Failing ignition module or possibly a sheared flywheel key. Try reducing spark plug gap to .025" .

Yamaha... | Answered on Oct 13, 2019


Mybe the problem is the frequency.
Visit the website www.dieselgeneratortech.com to get more support.

Yamaha... | Answered on Oct 09, 2019


There are several types of overload to consider:
A. Catastrophic: something has gone very wrong. There may be a phase to phase short or two shorts to ground. This assumes you have an ungrounded system. With luck the main circuit breaker will open without destroying itself;
B. Steady state over current: The load on the generator is greater than the rating on the circuit breaker. Time to parallel in another generatoror shed load;
C. Transient over current: Suppose you were running two generators in parallel and one failed. The remaining machine may experience an over current condition that causes the breaker to trip. You can also have transient breaker trips upon activation of a large motor e.g., fire pump or bow thruster;
D.Thermal: There is a big difference in sea water temperature as you travel the world. It is possible to have an overload caused by the diesel engine's inability to shed heat in the tropics. Continued operation could damage the diesel engine. Again, parallel in another generator or shed load.

Yamaha... | Answered on Sep 30, 2019


Is it overloaded? That's the most common reason!

Yamaha... | Answered on Mar 24, 2019


4 stroke engine?? syn 5w30 or straight 30w

Yamaha... | Answered on Aug 27, 2018


Remove the cover, and take off the broken cord, replace it with new.

Yamaha... | Answered on May 20, 2018


Check oil level and cooling air flow past the cylinder. Are there foreign material like leaves in the air intake?

Yamaha... | Answered on Mar 17, 2018


It should be stated on the id plate.

Yamaha... | Answered on Feb 21, 2018


Probably find that the carburetor jets are a bit clogged. Remove and soak in carburetor cleaner and then blow out with compressed air. Or alternately get a very fine drill set and clean, but be careful if choosing this method. Also clean the air filter. cheers

Yamaha... | Answered on Feb 19, 2018

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